What should i take to stop?

Since this has been only going on a few days and you give no history of fever, bloody diarrhea ,abdominal pain, this is most likely viral and will resolve on its own . You can use an OTC anti-diarrheal medicine such as Imodium.

Diarrhea usually has an underlying cause and, rather than simply take an antidiarrheal medication, it's advisable to see an expert (GI doctor) who can help search for the cause. Once the search for a cause is successful, the treatment will be more likely to be effective.